孩子的脸上洋溢着纯粹的喜悦。

The child's face lit up with ___sheer delight.

她的成功证明了纯粹的决心。

Her success is a testament to ___sheer determination.

一想到这次旅行，我就被纯粹的喜悦淹没了。

I was overwhelmed by ___sheer joy at the thought of the trip.